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Tue, 13 Sep 2016 14:50:10 +0000 From: Brijesh Singh To: , , , , , , , , Date: Tue, 13 Sep 2016 10:50:06 -0400 Message-ID: <147377820679.11859.11888810000954712438.stgit@brijesh-build-machine> In-Reply-To: <147377800565.11859.4411044563640180545.stgit@brijesh-build-machine> References: <147377800565.11859.4411044563640180545.stgit@brijesh-build-machine> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: SN1PR15CA0009.namprd15.prod.outlook.com (10.163.200.19) To SN1PR12MB0670.namprd12.prod.outlook.com (10.163.208.28) X-MS-Office365-Filtering-Correlation-Id: df2ee602-7dd4-45d8-96e9-08d3dbe5431c X-Microsoft-Exchange-Diagnostics: 1; SN1PR12MB0670; 2:j2glaxqDe2kTUw20G5+oblroDRspob6xWlJ4ogLvj3JOxq8TocoOEjQcFT5WWdibdwoAjMuq0rqnOHCgm9nlth6dN94hsvWuo+03TVqkhbRllEvi64xqozLj5SotFab6N13Idaca2o6qd62oxb6o2i2a+oWRw1Wyytk/Q5ABPCAmdHzZAv7EDYj2BYCs4dT5; 3:SxycCIpp2/hRqIPX22/SzEgjjPz7FrOD86MtVJxSP547+mIImEP19R5FQoQIkZLDAzxxRaExrLA0Dw0L5N3J9k8jK0MNPpwL7sPGsgTJXk/wF0/nx2codYCmD6UqAO92; 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Since the SeaBIOS executes in non PAE mode and does not have access to C-bit to create a shared page hence disable the dma operation when reading from fw_cfg interface. Signed-off-by: Brijesh Singh --- hw/nvram/fw_cfg.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c index 6a68e59..aca99e9 100644 --- a/hw/nvram/fw_cfg.c +++ b/hw/nvram/fw_cfg.c @@ -24,6 +24,7 @@ #include "qemu/osdep.h" #include "hw/hw.h" #include "sysemu/sysemu.h" +#include "sysemu/kvm.h" #include "sysemu/dma.h" #include "hw/boards.h" #include "hw/isa/isa.h" @@ -1009,6 +1010,11 @@ static void fw_cfg_io_realize(DeviceState *dev, Error **errp) FWCfgIoState *s = FW_CFG_IO(dev); SysBusDevice *sbd = SYS_BUS_DEVICE(dev); + /* disable dma on fw_cfg when SEV is enabled */ + if (kvm_sev_enabled()) { + qdev_prop_set_bit(dev, "dma_enabled", false); + } + /* when using port i/o, the 8-bit data register ALWAYS overlaps * with half of the 16-bit control register. Hence, the total size * of the i/o region used is FW_CFG_CTL_SIZE */